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In Typescript, How to check if a string is Numeric
...y to convert a string to a number is with Number, not parseFloat.
Number('1234') // 1234
Number('9BX9') // NaN
You can also use the unary plus operator if you like shorthand:
+'1234' // 1234
+'9BX9' // NaN
Be careful when checking against NaN (the operator === and !== don't work as expected wi...
How to install GCC piece by piece with GMP, MPFR, MPC, ELF, without shared libraries?
...nstall gcc # for Debian, Ubuntu, etc.
yum install gcc # for RedHat, CentOS, etc.
brew install gcc # for Mac OS X
The Hard Way
GCC says the answer here is "the hard way" because it builds everything piece by piece, and does not use shared libraries.
GCC infrastructure
Get the GCC infrastru...
How to call Base Class's __init__ method from the child class? [duplicate]
...
123
You could use super(ChildClass, self).__init__()
class BaseClass(object):
def __init__(se...
How to kill a process on a port on ubuntu
...
Is this OS independent or linux specific? If Linux specific then, even this command works os.system("fuser -k 8080/tcp");
– Ridhuvarshan
Jul 25 '18 at 12:04
...
Google Tag Manager 入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Of(“/jp/”) == 0) { … }
通配符，如：文章的地址：/article_123：
If (/article_\d+/.test(a)) { … } // 这儿用正则表达式来匹配末尾的数字。
实际的匹配条件会有很多种，这对于没有代码基础的网站分析人员可真是一种挑战啊，另外写...
How to remove a field completely from a MongoDB document?
... looks like this:
{
name: 'book',
tags: [
{
words: ['abc','123'],
lat: 33,
long: 22
}, {
words: ['def','456'],
lat: 44,
long: 33
}
]
}
To remove the column words from the embedded document, do this:
db.example.update(
{'tags': {'$exists':...
Greenlet Vs. Threads
...alls that would normally block the current thread, projects like gevent expose this concurrency without requiring change to an asynchronous API, and at significantly less cost to your system.
Concurrency is not parallelism
Threads vs. processes
Multiprocessing vs. threads
GIL vs. CPython
...
How do I output coloured text to a Linux terminal?
... This was the bee's knees on the BBS…
– Potatoswatter
Apr 11 '10 at 13:03
11
What does m ...
Update git commit author date when amending
...
FTR, looks like on OS X, date doesn't know -R. Using date without options did the job anyway
– ksol
Feb 2 '12 at 10:29
7
...
Fast permutation -> number -> permutation mapping algorithms
I have n elements. For the sake of an example, let's say, 7 elements, 1234567. I know there are 7! = 5040 permutations possible of these 7 elements.
...